Elastic elements for elastic suspensions in general



ly 2, 1957 L. PELLARIN! ETAL 2,797,916

ELASTIC ELEMENTS FOR ELASTIC SUSPENSIONS IN GENERAL Filgd Oct. 30. 1953 FIG.5.

United States Patent Ofiice 2,797,916 Patented July 2, 1957 Luigi Pellarini, Belmore, New South Wales, Australia, and Fabio Rossetti, Milan, Italy Application October 30, 1953, Serial No. 389,440

3 Claims. (Cl. 261-21) The present invention relates to an elastic element for elastic suspensions in general, characterized in that an articulated four faced frame contains a block of material having elastic properties, said block being bound to the four faces of said frame, the cross section (along a plane perpendicular to the articulations of said frame) of said block when in its resting position, having a parallelogram shape, with at least an acute angle, and said element being destined to be stressed so that the opening of said acute angle increases under load.

One preferred form of embodiment of the present invention is diagrammatically shown, merely by way of example, in the attached drawings, wherein:

Figure 1 is a perspective view of the frame containing the block of elastic material,

Figures 2, 3, and 4 show three different positions of said frame when stressed, and

Figure 5 shows the concerned qualitative diagram.

With reference to the drawings, 1 is the four faced frame, the surfaces whereof are articulated in 2, 3, 4 and 5.

6 is a block of rubber or rubber substitute contained in said frame, bound to the inner surfaces of the aforesaid faces, by means of adhesives. When in its resting position, said rubber block 6 has, on a plane perpendicular to the articulations, a cross section having a parallelogram shape with two opposite acute angles 7, 8.

Figures 2, 3 and 4 show three different positions of the frame 6 when stressed. The elastic element is connected in its hinging points 2, 3 to the part to be suspended, while the lever 9, of the part receiving the external stresses, is connected on the side 3, 4.

The three aforesaid positions are described with reference to Figure 5, showing on abscissae the deformations, and on the ordinates the external loads.

In said Figure 5, the curve 10 is the diagram of the moments due to the stresses produced in the block by causing the frame to deform the block from its position of rest. The area of the front surface of the frame remains constant while the volume of the block varies when the acute angle passes from to and beyond this value changing its sine when passing from 90 to the curve 11 is the diagram of the moments due to shear, and the curve 12 is the resultant of the two aforecited curves and in flexure is inverted in its central portion, corresponding about to the static load.

An elastic element, according to this invention, having the characteristic curve 12 has the advantage of avoiding the necessity of braking or damping elements, since the load variations are small for the normal deformation.

The load variations are only the ones necessary for bringing again the suspended part to its initial position, by overcoming its inertia.

We claim:

1. Elastic element for resilient suspensions in general, comprising an articulated four sided frame, within the frame a block of material having high elastic properties bonded to the inner surfaces of the four sides of said frame, said block, when in its resting position having a parallelogram shape in cross section with opposite acute angles, and means cooperating with one of said sides and adapted to stress said block so that the opening of said acute angles increases under load.

2. Element according to claim 1, in which each plane of the bonding of the block to the frame passes through the axes of two contiguous articulations.

3. Element according to claim 1, in which the articulations are arranged outside of the elastic block, so that the intersections of the bond surfaces coincide with the articulation axis.

References Cited in the file of this patent UNITED STATES PATENTS 1,875,314 Armstrong Aug. 30, 1932 1,919,033 Noble July 18, 1933 2,212,769 Boxan Aug. 27, 1940 FOREIGN PATENTS 25,794 France Feb. 6, 1923 (1st addition to No. 547,570) 275,519 Great Britain Aug. 11, 1927 724,359 Germany Aug. 24, 1942 

